Researchers at Arizona State University have designed the 4MM, a jetpack designed to help its wearer run a 4-minute mile, and expend less energy doing it. We've never even run a 6-minute mile, so we'll need to crank this thing up to 11.

That letter opener might soon go the way of the Dodo bird. According to AmEx, more and more Americans are sending paperless holiday greetings. Some 34 percent plan on sending holiday e-mails and 27 percent plan to simply post on Facebook. In this Tech Minute, CNET's Kara Tsuboi shares some ways to create digital greeting cards, perfect for sharing your holiday cheer